A Sulphur Cycle

A Sulphur Cycle In the cycle shown below there are three separate chemical reactions represented: Reaction 1 : Sulphur powder is heated strongly with iron filings in a test tube. After a while the contents of the tube will glow and iron II sulphide is formed.   Reaction 2 : Once the iron II sulphide has cooled down dilute hydrochloric acid is added to it. This is done in a fume cupboard since one of the products, hydrogen sulphide...

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main Chemical reactions

Chemical Names In most cases the name of a chemical tells you precisely which elements are present. When non-metal atoms are combined with metals their name changes slightly in the name of the compound. For example, calcium combined with oxygen will give calcium oxide. Whenever you come across a compound where the name finishes with -ide you know that this is, in fact, a combined non-metal atom. Image Name sodium chloride calcium...

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Angular Mechanics

Angular mechanics is a branch of mechanics. Angular mechanics involves the study of motion of a body in a rotational or a circular way. The angular momentum and torque are the most important and responsible part for angular mechanics. When the force is applied to a body that causes it to rotate then it creates torque. Similar to force, torque also acts to angularly accelerate a spinning object. The equation for torque (expressed as Γ here) looks very much like force in a linear motion (F = ma) because the torque is analogous...

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Gravity

An object released from some high above the surface of the earth falls freely with an acceleration. This accelerate motion is due to the force of attraction exerted by the earth on the object. The motion of the moon in a circular orbit around the earth also shows that the earth exerts a force of attraction between the sun and suggest the existence of a force of attraction between the sun and the plant. These observations led...

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Motion

Change in the position of an object with respect to time is the motion of an object is the motion of an object. Motion is one of the most important part of branch of physics called mechanics. Everybody on the Earth moves. The movement might be slow or very very slow. If we are standing on earth then earth moves around the Sun and Sun moves around the galaxy. It means that the movement of a body never stops. To have a motion of an object or to change its motion, the force should be acted on an object. When some Physicists observe...

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Law Of Motion

There are three laws of motion and they were first compiled by Sir Isaac Newton in his work Philosophiæ Naturalis Principia Mathematica, first published on July 5, 1687. Newton used these laws to explain and investigate the motion of many physical objects and systems. Newton showed that these laws of motion when combined with his law of universal gravitation, explained Kepler's laws of planetary motion. Newton's laws are applied only to bodies (objects) which are considered or idealized as a particle, in the sense that the extent...

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Banking of a Road Surface

Mechanics Banking of a Road Surface Moving in a Straight line on a Horizontal Surface Turning on a Horizontal Surface The normal reaction, R, has no component acting towards the centre of the circular path. Therefore the required centripetal acceleration is provided by the force of friction, Ff, between the wheel and the road. If the force of friction is not strong enough, the vehicle will skid. Turning...

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How Dry Cell Batteries Generate Electricity

written by: Aggeliki K. • edited by: Lamar Stonecypher • updated: 5/20/2011 Normally a dry cell is also referred to as a Zinc-Carbon Leclanche cell. It is an easily portable, compact, and modified form of Leclanche cell capable of producing an EMF of 1.5 V with a very small internal resistance in the order of 0.1 ohm. Dry Cell History and Advances The first dry cell was invented in the late 19th century....

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